Overview
The PCA9554APWG4, produced by Texas Instruments, is an 8-bit I2C/SMBus I/O expander designed to expand the I/O capabilities of microcontrollers. This device is particularly useful in applications where additional I/O ports are needed without the complexity of adding more microcontrollers. It features an open-drain active-low interrupt output, allowing the remote I/O to inform the microcontroller of incoming data without continuous I2C bus communication. The PCA9554APWG4 is available in a TSSOP (PW) package and is part of the PCA9554 family, which offers various package options and configurations.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Power-Supply Voltage Range | 2.3 to 5.5 | V |
| I2C Bus Frequency | 400 kHz | |
| Number of Hardware Address Pins | 3 (A0, A1, A2) | |
| Maximum Number of Devices on I2C/SMBus | Up to 8 devices (16 total with PCA9554 and PCA9554A) | |
| Input/Output Configuration | Input/Output Configuration Register and Polarity Inversion Register | |
| Interrupt Output | Open-Drain Active-Low | |
| Output Drive Capability | High-Current Drive for Directly Driving LEDs | |
| ESD Protection | 2000-V Human-Body Model, 200-V Machine Model, 1000-V Charged-Device Model | |
| Operating Temperature Range | -40 to 85 °C | °C |
| Package Type | TSSOP (PW) |
Key Features
- I2C to Parallel Port Expander
- Open-Drain Active-Low Interrupt Output
- Operating Power-Supply Voltage Range of 2.3 V to 5.5 V
- 5-V Tolerant I/Os
- 400-kHz Fast I2C Bus
- Three Hardware Address Pins Allow up to Eight Devices on the I2C/SMBus
- Input/Output Configuration Register and Polarity Inversion Register
- Internal Power-On Reset
- Power-Up With All Channels Configured as Inputs
- No Glitch On Power Up
- Latched Outputs With High-Current Drive Maximum Capability for Directly Driving LEDs
- Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II
- ESD Protection Exceeds JESD 22
Applications
The PCA9554APWG4 is suitable for various applications where I/O expansion is necessary, such as:
- Industrial Automation: Expanding I/O capabilities in control systems and automation equipment.
- Consumer Electronics: Enhancing the I/O functionality in consumer devices like smart home appliances and gaming consoles.
- Automotive Systems: Providing additional I/O ports in automotive control units and infotainment systems.
- Medical Devices: Expanding I/O in medical equipment and diagnostic devices.
- Embedded Systems: Increasing the I/O capacity in embedded systems, such as robots and IoT devices.
Q & A
- What is the PCA9554APWG4 used for?
The PCA9554APWG4 is an 8-bit I2C/SMBus I/O expander used to expand the I/O capabilities of microcontrollers.
- What is the operating voltage range of the PCA9554APWG4?
The operating power-supply voltage range is from 2.3 V to 5.5 V.
- How many devices can be connected on the same I2C/SMBus?
Up to eight devices of the same type (PCA9554 or PCA9554A) can be connected, allowing for a total of 16 devices (eight of each type) on the same I2C/SMBus.
- What is the purpose of the interrupt output?
The open-drain active-low interrupt output allows the remote I/O to inform the microcontroller of incoming data without continuous I2C bus communication.
- What are the ESD protection ratings for the PCA9554APWG4?
The device has ESD protection exceeding 2000-V Human-Body Model, 200-V Machine Model, and 1000-V Charged-Device Model.
- Can the PCA9554APWG4 drive LEDs directly?
Yes, the latched outputs have high-current drive capability for directly driving LEDs.
- What is the maximum operating temperature of the PCA9554APWG4?
The operating temperature range is from -40°C to 85°C.
- Is the PCA9554APWG4 compatible with other I/O expanders?
The PCA9554APWG4 is pin-to-pin and I2C address compatible with the PCF8574A, but software changes are required due to enhancements in the PCA9554A.
- What package type is the PCA9554APWG4 available in?
The PCA9554APWG4 is available in a TSSOP (PW) package.
- Does the PCA9554APWG4 have internal power-on reset?
Yes, the device features an internal power-on reset and power-up with all channels configured as inputs.
